add missing $ for including CLUEstering library

Author: waredjeb

scram-tools.file/tools/CLUEstering/CLUEstering.xml

@@ -2,6 +2,6 @@
   <use name="alpaka"/>
   <client>
     <environment name="@TOOL_BASE@" default="@TOOL_ROOT@"/>
-    <environment name="INCLUDE"   default="@TOOL_BASE@/include"/>
+    <environment name="INCLUDE"   default="$@TOOL_BASE@/include"/>
   </client>
 </tool>